feat: sync all remaining python source board configurations

mixly/boards/default_src/python_mixpy/generators/system.js

@@ -0,0 +1,22 @@
+export const controls_millis = function (_, generator) {
+    generator.definitions_.import_time = "import time";
+    var code = 'time.time()';
+    return [code, generator.ORDER_ATOMIC];
+}
+
+export const controls_end_program = function () {
+    return 'exit()\n';
+}
+
+export const time_localtime = function (_, generator) {
+    generator.definitions_.import_time = "import time";
+    var op = this.getFieldValue('op');
+    var code = "time.localtime()[" + op + "]";
+    switch (op) {
+        case "all":
+            var code1 = "time.localtime()";
+            return [code1, generator.ORDER_ASSIGNMENT];
+        default:
+            return [code, generator.ORDER_ASSIGNMENT];
+    }
+}